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arXiv 1606.01162cond-mat.mtrl-sciphysics.comp-phphysics.data-an
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基于竞争晶相热力学的大块金属玻璃光谱描述符

Spectral descriptors for bulk metallic glasses based on the thermodynamics of competing crystalline phases

Eric Perim, Dongwoo Lee, Yanhui Liu, Cormac Toher, Pan Gong, Yanglin Li, W. Neal Simmons, Ohad Levy, Joost J. Vlassak, Jan Schroers, Stefano Curtarolo

摘要:

近年来,金属玻璃由于其优异的性能和加工性能的独特组合而引起了相当大的兴趣。从已知参数预测大块金属玻璃形成体仍然是一个挑战,并且仍然通过试验和错误来搜索新系统。据推测,在与玻璃形成竞争的结晶相的结晶过程中,某种“混乱”可能起关键作用。在这里,我们提出了一个启发式的描述量化混乱,并证明其有效性的两个著名的玻璃形成合金系统的详细实验。通过这些结果提供的洞察力,我们开发了一个强大的模型,用于预测玻璃形成能力的基础上的光谱分解的几何和能量的结晶相从头计算的AFLOW高通量框架。我们的研究结果表明,金属玻璃相的形成可能是一个比目前估计的更常见的现象,超过17%的二元合金系统是潜在的玻璃形成。我们的方法能够精确定位有利的成分,克服阻碍新材料发现的主要瓶颈。因此,它表明,智能描述符,完全基于从第一原理计算和在线数据库中提供的竞争晶相的能量和结构,其他人的抢手的关键,加速发现新的金属玻璃。

英文摘要:

Metallic glasses have attracted considerable interest in recent years due to their unique combination of superb properties and processability. Predicting bulk metallic glass formers from known parameters remains a challenge and the search for new systems is still performed by trial and error. It has been speculated that some sort of "confusion" during crystallization of the crystalline phases competing with glass formation could play a key role. Here, we propose a heuristic descriptor quantifying confusion and demonstrate its validity by detailed experiments on two well-known glass forming alloy systems. With the insight provided by these results, we develop a robust model for predicting glass formation ability based on the spectral decomposition of geometrical and energetic features of crystalline phases calculated ab-initio in the AFLOW high throughput framework. Our findings indicate that the formation of metallic glass phases could be a much more common phenomenon than currently estimated, with more than 17% of binary alloy systems being potential glass formers. Our approach is capable of pinpointing favorable compositions, overcoming a major bottleneck hindering the discovery of new materials. Hence, it is demonstrated that smart descriptors, based solely on the energetics and structure of competing crystalline phases calculated from first-principles and available in online databases, others the sought-after key for accelerated discovery of novel metallic glasses.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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